It doesn't really make sense but they claim that they will return 4.5% a day. Then again, electricity does not really make sense to me, but my lights keep turning on.
Bitpetite is pretty simple. You login, enter how much you want to invest, and it estimates what you will earn in 6 or 9 weeks.
As an example, if you put in just 5 bitcoins, you would earn more than $1000 a day.
So far reports say that they have been paying out funds routinely. Of course, that does not mean it will last as many several services have shut down. If you want to give it a try, best of luck to you! I will cross my fingers that you get your funds back.